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Biofunctionalized Prussian Blue Nanoparticles for Multimodal Molecular Imaging Applications

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Published on: April 28, 2015

A colorimetric probe to determine Pb(2+) using functionalized silver nanoparticles.

Kwon-Chul Noh¹, Yun-Sik Nam², Ho-Jin Lee²

¹Advanced Analysis Center and Green City Technology Institute, Korea Institute of Science and Technology, P.O. Box 131, Cheongryangri, Seoul 130-650, Republic of Korea. leekb@kist.re.kr and Department of Chemistry, Korea University, P.O. Box 145, Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea.

|November 12, 2015

Summary

A new colorimetric method uses functionalized silver nanoparticles to detect lead (Pb2+) ions in water. This simple, cost-effective technique offers rapid and sensitive lead detection for environmental monitoring.

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Area of Science:

* Nanotechnology
* Environmental Chemistry
* Analytical Chemistry

Background:

* Lead (Pb2+) ions are toxic environmental pollutants.
* Accurate detection of Pb2+ in aqueous samples is crucial for environmental safety.
* Existing methods for Pb2+ detection can be complex or costly.

Purpose of the Study:

* To develop a simple, sensitive, and cost-effective colorimetric method for Pb2+ determination.
* To utilize 1-(2-mercaptoethyl)-1,3,5-triazinane-2,4,6-trione (MTT) functionalized silver nanoparticles (MTT-AgNPs) for Pb2+ sensing.
* To enable rapid and facile detection of Pb2+ in environmental water samples.

Main Methods:

* Synthesis of MTT-AgNPs.
* Inducing aggregation of MTT-AgNPs upon binding with Pb2+ ions via N-Pb2+-O coordination bonds.
* Colorimetric analysis (visual and UV-vis spectrometry) of MTT-AgNP aggregation.
* Optimization of detection conditions, including pH (7-8).

Main Results:

* A distinct color change from yellow to dark blue was observed upon Pb2+ addition.
* The method demonstrated a linear correlation between absorption ratios (A625/A395) and Pb2+ concentrations (0.1–0.6 μg mL−1).
* Low limits of detection were achieved: 0.02 μg mL−1 in tap water and 0.06 μg mL−1 in pond water.

Conclusions:

* The developed MTT-AgNP-based method provides a rapid, sensitive, and selective colorimetric approach for Pb2+ detection.
* This cost-effective sensing system is suitable for on-site or field determination of lead ions in aqueous environments.
* The method offers a practical alternative for environmental monitoring of lead contamination.